Black mordant monoazo dyestuff.



UNITED STATES PATENT OFFICE.

MYRTIL KAHN AND ANTON OSSENBECK, OF ELBERFELD, GERMANY, ASSIGNORS T0 FARBENFABRIKEN VORM. FBIEDR. BAYER, & (70., OF ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

BLACK MORDANT MONOAZO DYESTUFF.

No Drawing.

To all whom it may concern:

Be it known that we, MYn'rrL KAHN and ANTON OSSENBECK, citizens of the German Empire, residing at Elberfeld, Germany, have invented new and useful Improvements in Black Mordant Monoazo Dyestuil's, of which the following is a specification.

We have found that new and valuable mordant monoazo dyestuffs are obtained by combining diazo compounds of ortho-aminophenol-sulfonic acids with acidyl-1-amino-7- .ortho-aminophenol-sulfonic acid and 1.9-

diamino- 't-naphthol.

In order to illustrate the new process more fully the following example is given, the parts being by weight:22.4 parts of 4- chloro-2-aminophenol-6sulfonic acid are diazotized with 7 parts of sodium nitrite. The diazo compound is then added to a solution containing an excess of sodium carbonate of 21 parts of acetyl-1-amino7- naphthol in the calculated quantity of dilute caustic soda lye. The production of the dyestufi is soon finished. It is filtered ofl', pressed andl dried. It has most probably the formu 9.:

Specification of Letters Patent.

Patented Nov. 18, 1913.

Application filed December 6, 1912, Serial No. 735,262.

powder soluble in hot water with a violet coloration. It dyes wool from an acid bath in violet shades which on being chromed change into a blue-black fast to light and falling. Upon treatment with stannous chlorid and hydrochloric acid it is split up into 2-amino-lphenol-4-chloro-6-sulfonic acid and 1.8-diamino-7-naphth0l. Q-aminophenol-l-snlfonic acid itself or other derivatives of this acid 6. g. ortho-amino-paracresol-sulfonic acid or 6-chl0ro-2-aminophenol-4-s11lfonic acid maybe used. Other acidyl-1amino-7-naphthols such as the benzoyl compound may be used.

We claim 1. The herein described new mordant mono-azo dyestuffs of the following graphically represented structure R-N:N-R' where R is the radical of an ortho-phenob sulfonic acid and R the radical of an acidyll-amino-T-naphthol, which are after being 70 dried and pulverized in the shape of their alkaline salts dark powders soluble in hot water generally with a violet coloration; yielding upon reduction with stannous chlorid and hydrochloric acid a Q-aminohenolsulfonic acid and LB-diaminO-T- naphthol; dyeing wool in violet shades which after being chromed change into fast bluishblack to greenish-black shades an dyeing wool in one bath in the presence of 30 a chrome mordant, substantially as described.

2. The herein described new 2120 dyestufi having most probably the formula:

coca. 8 5

. OH H with stannous chlorid and'h yrh'ochloric acid setour hands in the presence of two sub- 2-amino-l-phenol-4-chl0r0-6-su1f0nic acid scribing Witnesses. and 1.8:diamin0-7-naphth0l; dyeing wool in MYRTIL KAI-IN.

L. s.] violet shades Which after being chromed ANTON OSSENBECK. [1,. 5.] 5 change into a blueblack fast to light and Witnesses:

fuliing, substantially as described. HELEN NUFER,

1n testimony whereof We have hereunto ALBERT NUFER. 

